Reduction of phosphatic materials



Patented July 12, 1932 wiLLieM nrweesammor non-'12 Muenn-Annssarilnron n;

silo-nine, ESSIG'N-QBS T oouonnm PHOSPHATE ooneona rion or new noun,

COMPANY, 7 OF nunuorro'nor mosrnnrremimnnmts f The present invention relates to" the re duction of phosphatio materials for the produ'ction oi phosphoruser phosphoric acid.

Theob-ject of the'inventionz-is to provide a method of producing a more readily redneible pliosphatic material than'has heretofore been. obm-ined suitable tor conversion I intoelemental phosphorus or'phosp'horie acid.-

Another object is to provide a. material the phosphate content of. which can reduced to phosphorus more cheaply than has heretofore been possible.

A still further object isto bring: about this reduction into elemental: phosphorus more quickly and completely than heretoiore by providing an intimate Contact between. the

phosphoric material: and the reducing agent.

it is well knownthatin orderto etlicient-ly reducethe P 0 content of phosphoric ma- "terials to elemental. phosphorus it is necesintosary to bring the phosphatic mineral contact with elemental carbon at an elevated temperature. The mixing of phosphate'rock and silica with. relatively large obviously does not bring about the desired intimate contact between the ore and reducing agent and if these materials areused in finely divided form smooth furnace operation is practically impossible and; so much dust is carried overin the gases that the gas mains or the ai'iXiliary furnace equipment often become partiallyelogged and the prod I not seriously contaminated.

To avoid these disadvantages it has been proposed to briquet a mixture of phosphate rock, silica and carbonaceous material'm cl to use such briquets as a 'iurnace charge, but the cost of drying, grinding; mixing" and the binder required'to produoea briquetcapable "of being handled'without dusting or breakage is such as tively costly.

We have foundthat a phosphate eharge-in even better condition for reduction than briquet's may be obtained by sintering the to render such a charge relaphosphate pebbles or run-of-mine material phosphate washers or a or dbrisfrorn the mixture of these I silicafor subsequent fluxingpurposes and incorporating in said sinterenough carbonasuch: as teem-eke lowing example is given,

the chute in'such a manner sion is substantially uniformly distributed 7 over the hotsinter coming-from the sinteringf materials with sufficient Application nee my 6, 1929: sermno 376,490.

ceous material to bring about a reduction of its P 0 content.

substantial eooeiien LAKE q YORK N. I, A

Not. only is the porous nature of the sint'er its: ready'inipregnation' with carbonrelatively easy but the freemovement oi? the gases through the porous sinterinakes it possible to drive relatively quickly and completely; a p

The impregnate as usedherein is intended to mean the incorporation A 0t car ionaceous' material in the interstieesoiithe' s'mtered phosphatic material.-

The sinter may be impregnated w ith car bonaoeous: material ina varietyof ways; all 0% which are ineluded within the scopeof the off the reducedphosphorus invention. Among tl-ieinethoclsjof eliecting theiinpregnation are:

(1) Sprinkling the phosphate sinter coke br'aizeafter the sintering process been-practically completed, the b-raize being added to the sinter' 2 Admixing hotto coke the coal withinthe mass;

Spraying'oil, taror' other liquid hydrocarbon intothe sint'er'wliilethe latter is hot to drive oil" or dec'onis, or liquid hydroearbenskse still sufliciently pose the gaseous that little or no volatile material remains anda'substantially dry product is produoedi i (4')- Drawing or forcing volatile li-ydro carbons-through a coluinn or-m'ass of thehot"- sintered product, thereby causing the (ieeOlibposition" of the hydrocarbons and deposition has either in dry form or as a suspension in the'w'ater used-for quenching. the sinter. V lumps of coke finely divided bituminous vcoal withthe sinter while it is still suifi'cien'tly' of earb'onin the pores orkbody of the sint'er.

In order to illustrate the invention, the folwherein the" iin pregnation of the sinter is effected by. quenehingwith a suspensionef'coke braize:

The hot sintered product is discharged from the sintering apparatus onto a chute" and afsuspension ofcoke braize inwater is T allowed-to flow over i ing 't'ank suspended abovethe upper end of j that the suspen machine; The concentration of Y coke in the? is impregnated may,

suspension and the rate of flow of'the slurry onto the hot sinter are preferably so adjusted that the quenched sinter will contain in the neighborhood of of fixed carbon.

The'amount of carbon with which the, sinter varied according to the amount of phosphorus pentoxide in the sinter, ariations in the reduction process used, and other variations in operating conditions. A

The production of phosphorus from the carbon impregnated material produced as described above, or in any other suitable Way, may be effected by charging the impregnated sinter into a furnace of W type either with or without the addition of race and a. blast furnace.

' further coke or other carbonaceous material.

The reduction may, also be advantageously effected in an electric furnace or in a furnace of an electric, furcombining the features Of course in a furnace of the blast furnace type, the temperature necessary for the reduction of the phosphatic charge is obtainedfby the combustion of excess carbonaceous material in.

mental form." f I V It will beseen that the present invention includes; a processfor the reduction of phosphatic material which comprisessintering phosphatic material, impregnating the sinter with carbonaceous material and sub ecting V the impregnated sinter to atemperature; at

. to phosphorus takes iwhich reduction of the phosphatic material place; and a newcompositionof matter suitable for? the produc- 55. phorusconiprising subjecting silicious'phos tion of. phosphorus comprising a sintered .phosphatic material impregnated with a car 45 bonaceous material. 7

wecla m 1. ,A'process for the production of phosphorus comprising subjecting phosphatic material to a sinteringoperation, impregnating. the sinter with carbonaceous material, and subjecting. the impregnated material to phatic material place. a p g 21A process for'the production of phos to phosphorus will take phatic m aterial to a'sintering operation, im; pregnatlng the sinter with carbonaceous material, and subjecting the impregnated mate v. V V

rial'to atemperature at which reduction of the phosphatic' material tophosphorus will take 3. process for production of phos phorus comprisingsubjecting silicious phos- 1131131310; material to, a-s nterlng operation, nn-

of course, be. widely.

the blast furnace or the phosphorus may be'separated from the, gases in the elepregnating the sinter with carbonaceous material by contacting the hot sinter with car bonaceous material, and subjecting the impregnated material to a temperature at which reduction of the phosphatic material to phosphorus will take place. I

4:. A; process for the pregnating the sinter with carbonaceous material by contacting the hot sinter with coke braize, and subjecting the impregnated material to a temperature at which reduction of take place. r

.5. A process for the production of phosphorus comprising subjecting silicious phosphatic materialto a sintering operation, impregnating the sinter with carbonaceous material by aqueoussuspension. of coke braize, and subthe phosphatic material to phosphorus Will,

quenching the hot sinter 'with an v 7 production ofphos- V phoruscomprising subjecting silicious phosphatic material to a sintering operation, im,

jecting theimpregnated material toa temperature at. which" reduction of" the phosphaticmaterial to phosphorus will take place;

63A for, the ing impregnating sintered phosphatic materail with carbonaceous material.

7. A for the production of phosphorus comprising impregnating sintered silicious mate rial'with carbonaceous material;

, 8. Aprocess .for making a product suitable forthe production of impregnating sintered' silicious phos'phatic material with carbonaceous material-by-cone while hot with a carbontacting. the sinter aceous material. ,j v e V V '9. A process for makingaproduct suitable for the production of phosphorus comprising impregnating-sintered silicious phosphatic process for making a product suitable production of phosphorus .comprisprocess forma'king a productsuitable.

phosphorus comprising g e phosphatic material with carbonaceous material by'contacting the sinter'while hot with coke braize.

10. A process for making a product suitable for the production of phosphorus com prising impregnating sintered silicious phosphatic material with carbonaceous; material by quenching the sinter while aqueoussuspension of coke braize.

11. A composition ofmatter suitable for V the production of phosphorus a temperature at which reduction of the P1103.

with carbonaceous material.

hot with an 12.. Acomposition of matter suitable for V the, production of phosphorus comprising silicious sinter'ed phosphatic material impregnated with carbonaceous material.

13. A composition of the, production of phosph silicious sintered phosphatic material ime pregnated with coke braize. 7

In testimony whereof weaflix our signa- 'tures.f..

WILLIAMHSPWAGGAMAN.. q STAPLETON neoocn.

matter, suitable for orus comprising 1 

